Question

Три седьмых +8 целых две третьих -2 20 первых

Answer 1

3/7 + 8 2/3 - 2 20/1 = -12.9047619

Answer 2

$\frac{3}{7} + 8 \frac{2}{3} - \frac{2}{21} = \frac{3}{7} + \frac{26}{3} - \frac{2}{21} = \frac{191}{21} - \frac{2}{21} = \frac{189}{21} = 9$